Statistics for Cornell Early Admission is out looks like there were 6319 applications out of which 1533 were admitted. A decrease in admit rate of ~1% but increase in absolute number admitted in ED. This might mean there will be less seats in RD round.
http://cornellsun.com/2017/12/20/cornell-early-decision-admissions-rate-drops-for-3rd-year-in-a-row/